کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7691991 | 1496018 | 2017 | 51 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preparation of silica doped titania nanoparticles with thermal stability and photocatalytic properties and their application for leather surface functionalization
ترجمه فارسی عنوان
آماده سازی نانوذرات تیتانیوم سیلیکا با استحکام حرارتی و خواص فتوکاتالیتی و کاربرد آنها برای عملکرد سطح چرم
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی (عمومی)
چکیده انگلیسی
Doped nanoparticles based on titanium dioxide are of interest for their multifunctional properties and enlarged photocatalytic activity in visible domain. Silica doped titanium dioxide nanoparticles were prepared by hydrothermal method and their structural characteristics and photocatalytic activity were determined, in order to be used for leather coating as alternative to halogen based flame retardants and dry cleaning solvents. A range of concentrations from 2% to 20% silica doped titanium dioxide nanoparticles (% denotes the theoretical weight percent of Si) was synthesized and characterized by ICP-OES, FT-IR, UV-vis spectroscopy, XRD, HRTEM and DLS. Titanium dioxide network penetration was supported by Si-O-Ti and OH identification in FT-IR spectra mainly on surface of 10% and 20% silica doped titanium dioxide nanoparticles. The increase of Si-O-Ti bonds with Si dopant concentration acts as efficient barriers against sinterization and growth of TiO2 particles and explains the low particle size identified in HRTEM analyses as compared to undoped TiO2NPs. UV-vis diffuse reflectance spectra of doped titanium dioxide nanoparticles showed the shifting of absorption band to visible domain for 10% silica doped titanium dioxide nanoparticles. The crystallite sizes were calculated from XRD spectra, ranging between 16.2 and 18.1Â nm. HRTEM measurement of hydrothermally synthesized titanium dioxide nanoparticles showed anatase crystallites in the range of 8.8-27Â nm, while in the 20% silica doped titanium dioxide nanoparticle sample smaller crystallite with sizes between 2.7Â nm and 3.5Â nm was identified due to the constraints of the SiO2-based amorphous matrix. Nano sizes of 64Â nm and 72Â nm were found in water dispersions of 10% and 20% silica doped titanium dioxide nanoparticles and the Zeta potentials were of â53.6Â mV and â52.9Â mV, which indicate very good stabilities. The leather surface treated with composites of film forming polymers and 10% silica doped titanium dioxide nanoparticles displayed photocatalytic properties against methylene blue dye under UV and visible light exposure, attributed to reactive species generation with effect on surface hydrophilicity increase. The activation energies for decomposition of leathers treated with 10% and 20% silica doped titanium dioxide nanoparticles were 2.083Â ÃÂ 104Â J/mol and 2.36Â ÃÂ 104Â J/mol respectively, as compared to 6.576Â ÃÂ 103Â J/mol for untreated leathers, showing increased thermal stability according to DSC measurements. The hydrothermal route for silica doped nanoparticle preparation proved advantages in enhancing photocatalytic properties in the visible domain and thermal resistance, with prospect for multifunctional applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Arabian Journal of Chemistry - Volume 10, Issue 7, November 2017, Pages 985-1000
Journal: Arabian Journal of Chemistry - Volume 10, Issue 7, November 2017, Pages 985-1000
نویسندگان
Carmen Gaidau, Aurora Petica, Madalina Ignat, Laura Madalina Popescu, Roxana Mioara Piticescu, Ioan Albert Tudor, Radu Robert Piticescu,